CN112848744B - Optical anti-counterfeiting element and anti-counterfeiting product - Google Patents
Optical anti-counterfeiting element and anti-counterfeiting product Download PDFInfo
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- CN112848744B CN112848744B CN201911192698.0A CN201911192698A CN112848744B CN 112848744 B CN112848744 B CN 112848744B CN 201911192698 A CN201911192698 A CN 201911192698A CN 112848744 B CN112848744 B CN 112848744B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/328—Diffraction gratings; Holograms
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Abstract
The embodiment of the invention provides an optical anti-counterfeiting element and an anti-counterfeiting product, and belongs to the technical field of anti-counterfeiting. The optical security element comprises: a substrate comprising a first surface and a second surface opposite to each other; a surface microstructure formed on at least a portion of the first surface of the substrate, at least a portion of the surface microstructure comprising a plurality of focusing elements, wherein each of the focusing elements constitutes a first full parallax dynamic image and the plurality of focusing elements constitutes a second full parallax dynamic image, the surface microstructure being defined such that when a light beam impinges the surface microstructure at an angle of incidence, light of a wavelength or range of wavelengths in the light beam interferes with constructive and/or plasmon absorption in the direction of reflected light, thereby causing the focusing elements to have a color characteristic. The optical anti-counterfeiting element can provide a clear full parallax image with dynamic characteristics; and any focusing unit constituting the full parallax image has any selectable color feature.
Description
Technical Field
The invention relates to the technical field of anti-counterfeiting, in particular to an optical anti-counterfeiting element and an anti-counterfeiting product.
Background
In order to prevent counterfeiting by means of scanning, copying and the like, holographic anti-counterfeiting technology is widely adopted as a solution of optical anti-counterfeiting technology in various high-safety or high-added-value printed matters such as bank notes, identification cards, product packages and the like, and a very good effect is achieved.
At the end of the last century, with the development of computer science and image processing technology, holographic anti-counterfeiting technology has entered the era of digital development, one of the most important achievements being the successful application of digital technology in the manufacture of synthetic holograms. The comprehensive utilization of various technologies and devices such as holographic technology, computer control system, spatial light modulation device, image processing technology and the like makes it possible to automatically shoot 'dot matrix' holograms, digital synthetic holograms also come from the beginning, and how to make digital holograms with large visual fields and full parallax becomes one of the hotspots of holographic anti-counterfeiting technology research of all countries in the world.
The specific effect of the full parallax image is that the image content can be seen by human eyes in any observation angle range which forms an acute angle with the normal direction of the observed plane, and the image content corresponding to different angles is different, namely, the binocular parallax in the full angle range. The full parallax anti-counterfeiting technology is one of the development directions of the current public optical anti-counterfeiting technology.
Disclosure of Invention
An object of an embodiment of the present invention is to provide an optical security element and a security product, which can implement a full parallax image with easily-described color characteristics.
In order to achieve the above object, an embodiment of the present invention provides an optical security element, including: a substrate comprising a first surface and a second surface opposite to each other; a surface microstructure formed on at least a portion of the first surface of the substrate, at least a portion of the surface microstructure comprising a plurality of focusing elements, wherein each of the focusing elements constitutes a first full parallax dynamic image and the plurality of focusing elements constitutes a second full parallax dynamic image, the surface microstructure being defined such that when a light beam impinges the surface microstructure at an angle of incidence, light of a wavelength or range of wavelengths in the light beam interferes with constructive and/or plasmon absorption in the direction of reflected light, thereby causing the focusing elements to have a color characteristic.
Correspondingly, the embodiment of the invention also provides an anti-counterfeiting product with the optical anti-counterfeiting element.
The optical anti-counterfeiting element provided by the embodiment of the invention can provide clear full parallax images with dynamic characteristics; and any focusing unit constituting the full parallax image has any selectable color feature.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1a to 1d show a cross-sectional view, a top view, a schematic view of dynamic effects, and illustrations illustrating color features of an optical security element according to an embodiment of the invention;
fig. 2a to 2d are schematic diagrams of an optical security element according to another embodiment of the present invention, wherein a focusing unit of the optical security element is a full-parallax dynamic image structure;
fig. 3a to 3c show schematic diagrams of an optical security element according to a further embodiment of the present invention, wherein the focusing unit in the optical security element is a sawtooth fresnel relief structure; and
fig. 4a and 4b show a situation in which the focusing elements do not overlap each other in a microscopic cell-interspersed manner and a situation in which the focusing elements are spatially separated, respectively, in an optical security element according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
An embodiment of the present invention provides an optical security element, which may include: a substrate comprising a first surface and a second surface opposite to each other; a surface microstructure formed on at least a portion of the first surface of the substrate, at least a portion of the surface microstructure comprising a plurality of focusing elements, wherein each of the focusing elements constitutes a first full parallax dynamic image and the plurality of focusing elements constitutes a second full parallax dynamic image, the surface microstructure being defined such that when a light beam impinges the surface microstructure at an angle of incidence, light of a wavelength or range of wavelengths in the light beam interferes with constructive and/or plasmon absorption in the direction of reflected light, thereby causing the focusing elements to have a color characteristic. The full parallax moving image is a full parallax image having a moving characteristic.
Each focusing unit can constitute the first full parallax image alone, and the plurality of focusing units together constitute the second full parallax dynamic image. The first full parallax dynamic images formed by each focusing unit may be the same or different, and the shapes of the first full parallax dynamic images and the second full parallax dynamic images may be the same or different. The first full parallax moving image and/or the second full parallax moving image may be images of arbitrary shapes, such as letters, characters, and/or specific signs, and the like. The structural parameters of each focusing unit constituting the second full-parallax dynamic image may be substantially the same or different.
The advantages and features of the optical security element of the embodiments of the present invention are explained below:
(1) the focusing units have specific first full-parallax dynamic images, namely, the dynamic images are carried in the focusing units, and further, a plurality of focusing units can form a complete second full-parallax dynamic image, so that the stroke edges of the second full-parallax dynamic color images formed by the plurality of focusing units are specific and clear, while the traditional full-parallax optical anti-counterfeiting image (for example, disclosed in the Chinese patent with the publication number of CN 105313528B) does not have specific dynamic image edges or stroke edges, thereby avoiding the problems of the traditional full-parallax image, such as blurring and poor image quality.
(2) The focusing unit has color characteristics, and the traditional full-parallax optical anti-counterfeiting image is a decolored image and cannot be colored.
(3) The color characteristics of the focusing unit are derived from the fact that the surface microstructure satisfies the structural parameter condition of interference constructive, and the color formed by the interference constructive is stable and easy to describe in the vicinity of the direction of reflected light and/or scattered light, which is distinct from achromatic or angle-dependent iridescence in traditional holographic security images.
The advantages and features ensure that the optical anti-counterfeiting element is easy to identify and difficult to forge.
Fig. 1a to 1d show a cross-sectional view, a top view, a schematic dynamic effect diagram, and a schematic representation illustrating color features of an optical security element according to an embodiment of the present invention. As shown in fig. 1a, an optical security element according to an embodiment of the present invention may include a substrate 1, where the substrate 1 has a first surface 11 and a second surface 12 opposite to each other, a surface microstructure 2 is formed on at least a portion of the first surface 11, and the surface microstructure 2 includes a plurality of focusing units 21, where fig. 1a shows a schematic cross-sectional view of only one focusing unit.
The focusing units 21 adopt a fresnel zone plate structure, the background area (i.e., "bottom surface covering area") of the focusing units 21 is circular, and the full parallax image formed by each focusing unit 21 moves in the respective circular area. The center of the Fresnel zone plate structure is expanded towards the periphery in a line form with different heights and increasing density. Human eyes can recognize that the focusing unit 21 has dynamic gloss like a circular relief surface under different visual angles, namely, in the visual angle moving process, the dynamic gloss on the Fresnel zone plate focusing unit moves along with the dynamic gloss to form full-parallax gloss, namely bright spots.
As shown in fig. 1b, a plurality of focusing units 21 of the fresnel zone plate structure constitute an image 3, the shape of the image 3 being the letter "Z". As shown in the figure, the different focusing elements may be arranged in a non-overlapping or partially overlapping arrangement to form the image 3.
As shown in fig. 1c, the fresnel zone plate of the focusing unit 21 has bright spots 31, i.e. bright spots with full parallax having dynamic characteristics, at different viewing angles, and therefore, the positions of the images "Z" formed by all the focusing units 21 are changed due to the change of the viewing angles, so as to form dynamic images "Z". The fresnel zone plate shown in fig. 1a and 1b will correspondingly implement the sinking or floating full parallax image feature of the dynamic image "Z".
In order to realize the color characteristics of the image "Z", as shown in fig. 1d, the structural parameters of a portion of the surface microstructure 2 of fig. 1a, which includes at least the focusing elements, are further defined as follows:
the characteristic dimension of the surface microstructure 2 in at least one in-plane dimension can be, for example, 0.3 μm to 6 μm, preferably 0.6 μm to 3 μm, in this case 1.5 μm to 5 μm. The term "characteristic dimension" refers to the dimension of the microstructure in any direction of the profile surrounding the convex or concave portion, wherein the average of the lowest and highest surface heights of the microstructure is taken to divide the surface. The topography of the surface microstructure 2 can be defined in that the raised portions of the surface microstructure 2 can occupy 20% to 80%, preferably 35% to 65%, in this case 45%, of the total area.
The cross-sectional shape of the focusing element may be sinusoidal, rectangular or saw-toothed, in this example rectangular is chosen. It will be appreciated by those skilled in the art that the cross-sectional shape of the focusing unit may also be other shapes.
The depth d of the surface microstructure 2 may satisfy the condition that, when natural light (white light) is irradiated at an incident angle α, light having a wavelength λ or a wavelength range interferes and lengthens in the reflected light direction after passing through the surface microstructure 2, so that the optical security element 1 appears a first color when viewed in the reflected light direction and a second color when viewed in the scattered light direction. "depth d" refers to the difference in height between the highest and lowest points of surface height in the microstructure.
The depth d of the surface microstructure 2 is typically between 100nm and 5 μm, preferably between 200nm and 3 μm. The depth d may be determined by the following method.
(ii) shows the complex amplitude transmittance τ of the surface microstructure 2g，τgAs a function of depth d, design wavelength λ, the groove type of the surface microstructure 2, the material refractive index distribution n and the position (x, y); ② complex amplitude transmittance taugPerforming Fourier transform; finding out the maximum condition of the reflected light (namely zero-order diffraction light) with the wavelength of lambda; and fourthly, calculating the depth d of the surface microstructure 2 according to the condition of maximum reflected light.
For example, when the design wavelength λ is 600nm, the refractive index n of the material of the surface microstructure 2 is 1.5, the cross-sectional shape of the surface microstructure 2 is sinusoidal, and the external medium is air, and d is 1528.8nm, the security element 1 appears red in the direction of reflected light and blue-green in the direction of scattered light. If d is 2668.8nm, the light having a wavelength of 410.8nm also satisfies the condition of constructive interference of reflected light, and therefore the security element 1 appears magenta in the direction of reflected light and green in the direction of scattered light.
In the embodiment, the structural parameters of at least a partial region including the focusing units are set to realize that the plurality of focusing units form the full-parallax dynamic color image, as described above with reference to fig. 1 d.
Optionally, the form of the focusing unit may be selected from a diffractive lens, a fresnel lens and/or a fresnel relief structure, and the cross section thereof may be a binary structure, a harmonic diffractive structure and/or a sawtooth structure. The shape of the background area of the focusing element may be circular, elliptical, square, polygonal and/or irregular. The shape of the background area of each focusing element may be the same or different.
Alternatively, the focusing unit may be selected as a full parallax image structure, and the cross section thereof may be a binary structure, a harmonic diffraction structure, and/or a sawtooth structure. The shape of the background area of the focusing element may be circular, elliptical, square, polygonal and/or irregular. The shape of the background area of each focusing element may be the same or different.
The arrangement period, the depth and/or the slope of the sawtooth of the section of the focusing unit along a certain direction of the surface on which the focusing unit is arranged are continuously changed from large to small or from small to large so as to form the full-parallax bright spot.
The definition of the surface microstructure 2 in conjunction with fig. 1d described above makes a plurality of focusing units form a full-parallax dynamic color image, and certainly, the color at any position in the full-parallax dynamic color image can be defined according to the definitions of the depth d, the feature size and the microstructure morphology in different regions or different units.
However, it should be noted that:
(1) the color features of the focusing unit can be freely defined by directly defining the feature size and the depth d and/or microstructure topography of the binary structure, which is a binary fresnel lens, a diffractive lens, a fresnel relief, and/or a binary full parallax image structure, etc., only when the cross section of the focusing unit 21 is a binary structure.
(2) When the cross section of the focusing unit 21 is a non-binary structure such as a harmonic diffraction structure or a sawtooth structure, a binary structure needs to be formed on the non-binary structure in a modification or superposition manner, and then the binary structure is defined according to the feature size, the depth d and/or the microstructure morphology, so as to define the color feature of the focusing unit. In addition, optionally, the plasma absorption structure may also be formed by modifying or superimposing the non-binary structure, the plasma absorption structure is a one-dimensional or two-dimensional submicron structure having a period or characteristic dimension of less than 500nm and a depth of less than 500nm, and the shape of the plasma absorption structure may be zigzag, sinusoidal, rectangular, or curved within the above-mentioned dimension range. The plasma absorption structure has selective absorption and reflection functions on light wavelength, and can enable a part of incident light to be absorbed and the other part to be reflected to enter human eyes to form specific color characteristics.
(3) Of course, when the cross section of the focusing unit 21 is a binary fresnel lens, a diffractive lens, a fresnel relief or a binary full-parallax image structure, an additional binary structure may be further formed in a modification or superposition manner, and the additional binary structure is defined according to the feature size, the depth d and/or the microstructure morphology, so as to define the color feature of the focusing unit. Alternatively, the plasma absorbing structure may be further formed in a modified or superimposed manner. The plasma absorption structure is a one-dimensional or two-dimensional submicron structure with the period or characteristic dimension below 500nm and the depth below 500nm, and the shape of the plasma absorption structure can be zigzag, sinusoidal, rectangular or curved in the above dimension range. The plasma absorption structure has selective absorption and reflection functions on light wavelength, and can enable a part of incident light to be absorbed and the other part to be reflected to enter human eyes to form specific color characteristics.
Fig. 2a to 2d show schematic diagrams of an optical security element according to another embodiment of the present invention, in which a focusing unit in the optical security element is a full parallax dynamic image structure. Fig. 2a shows an arrangement form of the focusing units, the shape of the background area is square, the positions of the "S" in the focusing units are different under different viewing angles, the "S" areas from different positions adopt a sawtooth structure with different parameters, and the period, depth, slope and orientation of the sawtooth determine the angle at which the "S" of the current position can be observed. The sawtooth structures representing the S' S at different positions are randomly or pseudo-randomly interspersed or overlappingly arranged in the square area to form a complete focusing unit.
The specific structure and calculation method of the full parallax image structure adopted by the focusing unit are described in chinese patent with publication number CN105291630B, but the focusing unit of the present application may not have the plating layer described in patent CN 105291630B.
In order to realize the colorization of the focusing unit, as shown in fig. 2b, the binary structure 4 is at least partially superimposed on the sawtooth structure, and the binary structure 4 and the sawtooth structure form a complete focusing unit, and then form the surface microstructure 2 together with other focusing units. The binary structure 4 may have the same refractive index as the sawtooth structure. The binary structure 4 is defined such that when a light beam impinges the surface microstructure at an angle of incidence, light of a wavelength or wavelength range in the light beam interferes constructively in the direction of the reflected light. When the design wavelength λ is 600nm, the refractive index n of the material of the binary structure 4 is 1.5, the cross-sectional shape of the binary structure 4 is rectangular, and the external medium is air, and d is 2668.8nm, light having a wavelength of 410.8nm satisfies the interference phase lengthening condition of reflected light, and exhibits magenta in the direction of reflected light and green in the direction of scattered light.
When the focusing element in fig. 2a constitutes an image "Z", as in fig. 2c, the position at which "Z" will be seen at different viewing angles changes, while "Z" has a color characteristic of magenta in the direction of reflected light and a green characteristic in the direction of scattering near the reflected light.
As shown in fig. 2d, the sawtooth structure in fig. 2b is at least partially superimposed with a plasma absorption structure 5, and the plasma absorption structure 5 and the sawtooth structure form a complete focusing unit, and then form the surface microstructure 2 together with other focusing units. The plasmonic absorption structure 5 is defined such that when a light beam impinges the surface microstructure at an angle of incidence, light of one wavelength or range of wavelengths in the light beam is absorbed (i.e. selectively absorbed) by the plasmons and light of the remaining wavelengths is reflected. The plasma-absorbing structure 5 in this example is of sinusoidal channel type with a period of 300nm and a depth of 100nm and is distributed in an orthogonal two-dimensional grid. In this embodiment, the plasma absorbing structure causes the focusing unit to appear red when viewing the optical security element.
Fig. 3a to 3c show schematic diagrams of an optical security element according to a further embodiment of the present invention, wherein the focusing unit in the optical security element is a sawtooth fresnel relief structure. Fig. 3a shows the arrangement form of the focusing units, the shape of the background area is an ellipse, and the positions of the bright spots in the focusing units are different under different viewing angles, so that a full parallax dynamic bright spot is formed. The dynamic bright spots are derived from simulation of a zigzag Fresnel relief structure on any real curved surface (such as the curved surface K in fig. 3 a) or simulation on any abstract or imaginary curved surface, and when incident light irradiates the surface of the Fresnel relief structure, the incident light is equivalent to irradiating a certain position on the simulated curved surface K and then reflecting the certain position to human eyes.
In order to realize the colorization of the focusing unit, as shown in fig. 3b, the binary structure 4 is at least partially superimposed on the saw-tooth fresnel relief structure, the binary structure 4 and the saw-tooth fresnel relief structure form a complete focusing unit, and then the surface microstructure 2 is formed together with other focusing units. The binary structure 4 is positioned such that when a light beam impinges the surface microstructure at an angle of incidence, light of a wavelength or wavelength range in the light beam interferes constructively in the direction of the reflected light. When the design wavelength λ is 600nm, the refractive index n of the material of the surface microstructure 2 is 1.5, the cross-sectional shape of the binary structure 4 is rectangular, and the external medium is air, then when d is 500nm, yellow appears in the direction of reflected light, and blue appears in the direction of scattered light.
When the focusing element in fig. 3a forms an image "Z", as in fig. 3c, the position at which the image "Z" will be seen at different viewing angles changes, while "Z" has a color characteristic of yellow in the direction of reflected light and a color characteristic of blue in the direction of scattered light in the vicinity of the reflected light.
The selection of the focusing units in each of the above embodiments is the same, and it is of course possible to make different structural selections for each focusing unit, thereby forming a more unique full-parallax color image.
The focusing elements may be directly superimposed in-plane as shown in fig. 1b, may be spatially separated, and/or may not be superimposed on each other with the microscopic elements interspersed. Fig. 4a shows a case where the focusing elements of the background area, which are hexagonal in shape, and the focusing elements of the background area, which are pentagon in shape, are not superimposed on each other in a microscopic cell-interspersed manner. Fig. 4b shows a situation where the focusing elements of the background area, which are diamond shaped, are spatially separated from the focusing elements of the background area, which are fan shaped.
Preferably, the surface microstructure can be obtained through micro-nano processing modes such as optical exposure, electron beam exposure and the like, and batch replication is performed through processing modes such as ultraviolet casting, mold pressing, nano imprinting and the like.
In a further alternative embodiment of the present invention, the surface microstructure may be covered with a single-layer or multi-layer coating, and the single-layer or multi-layer coating may conformally cover the surface microstructure. The coating can be a single-layer metal coating; a plurality of metal coatings; a coating formed by sequentially stacking an absorption layer, a low-refractive-index dielectric layer and a reflection layer; a multi-medium layer coating formed by sequentially stacking a high-refractive-index medium layer, a low-refractive-index medium layer and a high-refractive-index medium layer; and a coating layer formed by sequentially stacking the absorption layer, the high-refractive-index dielectric layer and the reflection layer. The structure of the coating can be called as an interference type multilayer film structure, and the interference type multilayer film structure can form a Fabry-Perot resonant cavity which has a selective effect on incident white light, so that emergent light only comprises certain wave bands, and specific colors are formed; when the incident angle changes, the relative optical path changes, the interference wave band also changes, thereby causing the color presented to the observer to change, and forming the light variable effect. In the embodiment according to the present invention, the high refractive index dielectric layer refers to a dielectric layer having a refractive index of 1.7 or more, and the material thereof may be ZnS, TiN, TiO2、TiO、Ti2O3、Ti3O5、Ta2O5、Nb2O5、CeO2、Bi2O3、Cr2O3、Fe2O3、HfO2ZnO, etc., the low-refractive-index dielectric layer refers to a dielectric layer with the refractive index less than 1.7, and the material of the low-refractive-index dielectric layer can be MgF2、SiO2And the like. The material of the reflecting layer can be metal such as Al, Cu, Ni, Cr, Ag, Fe, Sn, Au, Pt and the like or mixture and alloy thereof; the absorbing layer material can be metal such as Al, Cr, Ni, Cu, Co, Ti, V, W, Sn, Si, Ge, etc. or their mixture and alloy.
The single or multiple layers of plating may be formed by physical and/or chemical deposition methods, including, but not limited to, thermal evaporation, magnetron sputtering, MOCVD, molecular beam epitaxy, and the like, for example. Alternatively, the plating layer may be formed on the surface relief structure layer in a conformal coverage. Optionally, at least one of the plating layers is patterned and hollowed out.
In a further alternative embodiment of the present invention, diffractive holographic microstructures or non-diffractive surface microstructures may also be included in the surface microstructure.
In further optional embodiments of the present invention, one or more of the following may be added to the optical security element: the conductive layer, the magnetic layer and the layer formed by the material with infrared characteristic, ultraviolet characteristic or polarization characteristic are correspondingly added with conductive anti-counterfeiting characteristic, magnetic machine-readable anti-counterfeiting characteristic, infrared characteristic, ultraviolet characteristic or polarization characteristic.
The optical anti-counterfeiting element according to the embodiment of the invention is suitable for various anti-counterfeiting products or tickets, and is particularly suitable for manufacturing windowed security threads, labels, marks, wide strips, transparent windows, laminating films and the like. The thickness of the security thread is not more than 50 μm. The anti-counterfeiting paper with the anti-counterfeiting element can be used for anti-counterfeiting of various high-security products such as bank notes, passports, securities and the like.
In another aspect, the present invention provides an optical anti-counterfeiting product having the optical anti-counterfeiting element according to any embodiment of the present invention, wherein the product includes, but is not limited to, various high security products and high value-added products such as bank notes, credit cards, passports, securities, and the like, and various packaging paper, packaging boxes, and the like.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (16)
1. An optical security element, comprising:
a substrate comprising a first surface and a second surface opposite to each other;
a surface microstructure formed on at least a portion of the first surface of the substrate, at least a portion of the surface microstructure comprising a plurality of focusing elements, wherein each of the focusing elements constitutes a first full parallax dynamic image and the plurality of focusing elements constitutes a second full parallax dynamic image,
the surface microstructure is defined such that when a light beam impinges the surface microstructure at an angle of incidence, light of a wavelength or wavelength range in the light beam interferes with constructive and/or plasmon absorption in the direction of reflected light, thereby imparting a color characteristic to the focusing element.
2. An optical security element according to claim 1, wherein the focusing elements are selected in the form of diffractive lenses, fresnel lenses and/or fresnel relief structures, the cross-section of which can be binary, harmonic and/or sawtooth structures.
3. An optical security element according to claim 1, wherein the form of the focusing elements is selected to be a full parallax image structure, which may have a binary structure, a harmonic diffractive structure and/or a sawtooth structure in cross-section.
4. An optical security element according to claim 1, wherein the background area of the focusing unit is shaped to one or more of: circular, oval, square, polygonal, and/or shaped.
5. An optical security element according to claim 1, wherein when the cross section of the focusing unit is a binary fresnel lens, a diffractive lens, a fresnel relief and/or a binary full parallax image structure, the color features of the focusing unit are defined by defining the feature size, depth and/or microstructure topography of the focusing unit.
6. An optical security element according to claim 1, wherein the focusing elements comprise binary structures formed by means of decoration or superposition, wherein the color characteristics of the focusing elements are defined by defining the feature size, depth and/or microstructure morphology of the binary structures.
7. An optical security element according to claim 5 or 6, wherein the feature size in at least one dimension is 0.3 μm to 6 μm;
the depth is 100nm-5 μm; and/or
The microstructure morphology is 20-80% of the total area of the raised portions.
8. An optical security element according to claim 7,
the feature size in at least one dimension is 0.6 μm to 3 μm;
the depth is 200nm-3 μm; and/or
The microstructure morphology is 35% -65% of the total area of the raised portions.
9. An optical security element according to claim 1, wherein the form of the focusing element is selected to be a plasmonic absorbing structure and/or the focusing element comprises a plasmonic absorbing structure formed in a modified or superimposed manner.
10. An optical security element according to claim 9, wherein the period or characteristic dimension of the plasmonic absorption structure or the plasmonic absorption structure formed in a modified or superimposed manner is less than 500nm and the depth is less than 500 nm.
11. An optical security element according to claim 9 or 10, wherein the cross-section of the plasmonic absorption structure or the modified or superimposed plasmonic absorption structure is saw tooth shaped, sinusoidal shaped, rectangular shaped, and/or curved.
12. An optical security element according to claim 1, further comprising:
a single or multiple layers of plating overlying the surface microstructures.
13. An optical security element according to claim 12, wherein at least one of the one or more coatings is patterned through.
14. An optical security element according to claim 1, wherein the surface microstructures further comprise diffractive holographic microstructures or non-diffractive surface microstructures.
15. An optical security element according to claim 1, further comprising one or more of: a conductive layer; a magnetic layer; a layer composed of a material having infrared characteristics, ultraviolet characteristics, or polarization characteristics.
16. A security product having an optical security element according to any one of claims 1 to 15.
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| ES2644361T3 (en) * | 2005-05-18 | 2017-11-28 | Visual Physics, Llc | Imaging system and micro-optical security |
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| AP2013006993A0 (en) * | 2010-09-03 | 2013-07-31 | Securency Int Pty Ltd | Optically variable device |
| CN105313528B (en) * | 2014-08-01 | 2017-12-29 | 中钞特种防伪科技有限公司 | A kind of full parallax diffraction light change image optical anti-counterfeit element |
| AU2016100402B4 (en) * | 2016-04-13 | 2017-08-17 | Ccl Secure Pty Ltd | Micro-optic device with integrated focusing element and image element structure |
| CN110450560B (en) * | 2018-05-08 | 2020-12-25 | 中钞特种防伪科技有限公司 | Optical anti-counterfeiting element, preparation method thereof and optical anti-counterfeiting product |
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Address after: 100070 No. 6 Spark Road, Science City, Beijing, Fengtai District Patentee after: ZHONGCHAO SPECIAL SECURITY TECHNOLOGY Co.,Ltd. Patentee after: China Banknote Printing and Minting Group Co.,Ltd. Address before: 100070 No. 6 Spark Road, Science City, Beijing, Fengtai District Patentee before: ZHONGCHAO SPECIAL SECURITY TECHNOLOGY Co.,Ltd. Patentee before: CHINA BANKNOTE PRINTING AND MINTING Corp. |